Assessing lead-contaminated drinking water in a large academic institution: a case study

Area of Science:

• Environmental Health
• Public Health
• Analytical Chemistry

Background:

• Drinking water is a significant pathway for human exposure to lead.
• Identifying lead sources in large institutional settings is complex and resource-intensive.
• Variability in lead levels necessitates robust assessment methods.

Purpose of the Study:

• To investigate lead concentration variability in drinking water at a large university.
• To analyze variations in first-draw samples and with different dispensed volumes.
• To inform strategies for managing lead exposure in institutional water systems.

Main Methods:

• Sampling of over 350 drinking water sources at a university.
• Duplicate sampling by independent groups to assess reproducibility.
• Intensive sampling of nine selected sources to analyze lead concentration over dispensed volume.
• Analysis of lead concentrations using established laboratory methods.

Main Results:

• Significant variability in lead concentrations was observed across samples and sources.
• Nearly 10% of samples showed lead concentration differences greater than 10 μg/L.
• Five sources exceeded 100 μg/L, with a maximum detection of 400 μg/L.
• Lead concentration profiles varied with dispensed volume, with some sources peaking at higher volumes.

Conclusions:

• A single or limited number of samples may not accurately represent lead levels in all drinking water sources.
• The observed variability underscores the need for comprehensive sampling strategies in institutional settings.
• Water management plans must consider the dynamic nature of lead concentrations to ensure effective exposure control.